How would you react??

MEW • 36 & Married since 2013 w/ 3 month baby💙

So, I've been married 2+ years and in my step child's life for over 7 years! Father and child have a wonderful relationship and child is a delight.

Bio mom after all these years is still upset I show up to sports games ( I have since the the beginning). I get dirty looks or text message asking why I show up! She is a stereotype angry, rude, immature and a game player. Even her parents say hello to me and hug me!

She is bound to come up to me because she is so reactive and the sight of me makes her so angry....

I need advice how should I handle this?

Little more info, they were never married and her other kid's father left her at the alter.